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German Aerospace Center DLR

Start your mission with DLR.

The German Aerospace Center DLR has a dual mandate as the national research center for aeronautics and space, and as the space agency of the German federal government. Approximately 8,000 people work for DLR on a uniquely diverse range of topics spanning the fields of aeronautics, space, energy, transport and security research. They collaborate on projects extending from fundamental research to the development of the innovative applications and products of the future. If the idea of joining a top-class team of researchers working in a supportive, inspirational environment appeals to you, then why not launch your mission with us?

Our Institute for Aerodynamics and Flow Technology in Göttingen offers a

PhD Position

Aerodynamics and aeroacoustics of subsonic turbulent jets using advanced particle tracking methods and microphone measurements

Your mission:
Expressions of interest are sought for an exceptional PhD candidate to conduct fundamental research on the topic of jet aerodynamics and jet noise and further development of the 4-pulse Shake-The-Box Lagrangian particle tracking techniques. Jet noise remains an important topic today as it makes up a significant portion of the total noise of a starting and landing aircraft. Commercial airliners have made large efforts to reduce this noise in order to comply with noise restrictions and future standards. Active research in the field has already seen the implementation of suppression strategies such as chevron nozzles (used by modern day aircraft such as the Boeing 787). But the mechanisms by which turbulent jet flows produce noise are still not fully understood. The continued design and development of low noise jet engines will be further enhanced by improving the understanding of these mechanisms. In the past, experiments have only provided limited information about the jet aerodynamics and -acoustics, due to the inability to obtain instantaneous and high spatial resolution measurements in a volume. Recent developments at DLR in advanced Lagrangian Particle Tracking (LPT), namely the Shake-The-Box (STB) algorithm, together with Navier-Stokes-regularized interpolation methods (FlowFit) have shown promising means to provide the required information to link the aerodynamic aspects of the flow (sources of sound) with the acoustic aspects (noise) emanating from the flow. In that regard, a high quality and extensive experimental test campaign using the multi-pulse STB technique combined with synchronized microphone aeroacoustics measurements on a round and chevron nozzle at high subsonic flow speeds has been completed in 2016. The preliminary results have shown promise for unprecedented spatial resolution and with the potential for further analysis to provide a wealth of information never before achieved in the field.

The PhD candidate will conduct:
  • Image processing, multi-pulse STB evaluation and subsequent FlowFit interpolation of the large experimental data set using High-Performance-Computing resources
  • Analysis of the fluid mechanical properties of the subsonic turbulent jet flows by one-, two- and multipoint statistics of velocity, pressure and acceleration
  • Investigations of coherent structures and related velocity gradients in different regions of the various jet flows
  • Determine local 3D causality-correlation functions between microphone signals and velocity fluctuations with a specific focus on the jet shear layer development
  • Compare aerodynamics and aeroacoustics of round and chevron nozzles
  • Present research results on international conferences and in peer reviewed journals

DLR is offering a unique opportunity to be involved in a fundamental research study at the same time providing comprehensive and interdisciplinary training, with a work programme consisting of both computational and experimental components. The scientific training takes place in a dynamic and excellent scientific environment of modern facilities and under a pioneering, innovative world renowned team and in cooperation with various universities. The candidate must have aerody­na­mics or fluid mechanics background with a preference for experience in advanced experimental techniques and strong programming skills.

Your qualifications:
  • University degree in engineering or in applied mathematics or in physics or in physics and computer science
  • excellent diploma or master's degree, which enables to participate in a German doctoral program. Also candidates nearing completion are invited to apply
  • good programming skills in C, C++
  • good programming skills in Python and/or Matlab
  • some experience in advanced experimental techniques (PIV, Microphone etc.)
  • excellent knowledge of mathematical modelling of aeroacoustics and fluid mechanics preferable
  • very good German and English language skills
  • good knowledge of fluid mechanics is desirable
  • ideally knowledge in aeroacoustics
  • great interest in fundamental research in aerospace
  • great motivation and commitment to science
  • willingness to travel (international)

Your benefits:
Look forward to a fulfilling job with an employer who appreciates your commitment and supports your personal and professional development. Our unique infrastructure offers you a working envi­ronment in which you have unparalleled scope to develop your creative ideas and accomplish your professional objectives. Reconciling family and working life as well as equal opportunities for wo­men and men are an integral part of our HR policy. We therefore strongly encourage applications from women. Disabled applicants with equivalent qualifications will be given preferential treatment.

If you have any questions concerning specific aspects of the job, please contact Andreas Schröder by calling +49 551 709-2190. Please find further information on this vacancy with the reference number 09402, and details regarding the application procedure, at www.DLR.de/dlr/jobs/#24254.

Published on academics.com on date 6 October 2017
In your application, please refer to academics.com

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